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Stockholders' Equity and Stock-based Compensation - Schedule of Warrants Activity (Details) - Warrant [Member]
 9 Months Ended
Sep. 30, 2018
$ / shares
shares
Number of Shares Subject to Warrants, Outstanding, beginning balance 6,264,215
Number of Shares Subject to Warrants Outstanding, Granted
Number of Shares Subject to Warrants Outstanding, Exercised (1,798,558)
Number of Shares Subject to Warrants Outstanding, Expired (115,688)
Number of Shares Subject to Warrants, Outstanding, ending balance 4,349,969
Weighted average remaining contractual life of the outstanding warrants in years 2 years 22 days
Weighted avg. Exercise Price, outstanding, beginning balance | $ / shares $ 1.91
Weighted avg. Exercise Price, exercised | $ / shares 1.79
Weighted avg. Exercise Price, expired | $ / shares 6.94
Weighted avg. Exercise Price, outstanding and exercisable, ending balance | $ / shares $ 1.90